LP3917RL-S/NOPB

PMIC stands for Power Management Integrated Circuit and refers to a device that integrates numerous government and control functions for a system’s power supply. Specialty PMICs are designed to meet specific requirements for a specific type of circuit, such as the LP3917RL-S/NOPB. This article will discuss the application field and working principle of the LP3917RL-S/NOPB.

The LP3917RL-S/NOPB is a low power voltage monitor (LVM) regulator with an adjustable reset threshold. It is an ideal solution for applications needing an configurable volts over-voltage protection. Some of the typical applications for the LP3917RL-S/NOPB include mobile and portable devices that require a system protection, as well as industrial and automotive systems. The chip also finds use in battery protected devices, such as cell phones and tablet computers, as well as motor controls and embedded systems.

The LP3917RL-S/NOPB is a three pin SOT23-3 device and operates at a voltage range of 1.7V to 5.5V. There is an internal voltage detector with an open Collector output and a fixed period to hold the output low. The output can be configured as either an active high signal or active low signal. The nominal detection voltage is adjustable from 0.89V to 4.348V. The current consumption of the LP3917RL-S/NOPB is less than 1µA.

The LP3917RL-S/NOPB uses the SCOS (Signal Controlled Output Stage) architecture which reduces the power supply current compared to the traditional implementation of a comparator. This architecture ensures that the comparator does not draw additional current when the differential voltage is high. The output state of the LP3917RL-S/NOPB is determined by a combination of the comparator voltages, the reference voltage and the hysteresis levels.

The working principle of the LP3917RL-S/NOPB is based on a differential amplifier architecture with a comparator stage and a transistor based signal controlled output stage. The comparator compares the input voltage with a voltage reference. If the input voltage is greater than the reference voltage, a signal is sent to the signal controlled output stage that switches the output to the desired state. The signal controlled output stage is used to drive an external FET which provides the overvoltage protection.

The LP3917RL-S/NOPB has a low quiescent current making it an ideal choice for battery powered applications such as motor control and embedded systems. The adjustable reset threshold makes it a perfect suit for applications that require adjustable system protection. The signal controlled output architecture ensures low power consumption even in high differential voltage scenarios.

In conclusion, the LP3917RL-S/NOPB is an ideal solution for applications needing an configurable over-voltage protection. It is a low power voltage monitor (LVM) regulator with an adjustable reset threshold and is suitable for mobile and portable systems, industrial and automotive systems, battery protected devices, motor controls and embedded systems. The chip operates at a voltage range of 1.7V to 5.5V and employs the SCOS architecture to ensure low power consumption.